I purchased a 1987 Fiero GT with a 3800SC and 5 Speed manual and have had some clutch slipping issues, on a fairly new Centerforce Dual Friction clutch installed by the previous owner.

Currently I've removed the clutch to determine what is causing these issues and I was hoping to get some input from others to determine if I am on the right track to a solution.

So far I've found the following:
1. Clutch will slip in 4th and 5th gear when accelerating aggressively.
2. Clutch disengagement point is closer to the top of the pedal travel.
3 Clutch Cover Rivets were contacting the transmission bellhousing and have worn a groove into it.
4. The clutch release fingers also were contacting the clutch pressure pressure plate.
5. There are some metal shavings on the transmission input shaft, which I suspect came from interference 3 and 4.
6. When measuring the fly wheel thickness, I end up with 0.885", which based on my reading is about 0.065" thicker than it should be.

My current theory and plan are as follows:

The excess fly wheel thickness was causing the clutch to contact the transmission housing, potentially also not completely engaging the clutch, creating the slipping issue.

To address this, I plan to have flywheel machined down to 0.820" or order the Spec SC62A Aluminum flywheel designed for this application, then install a new clutch.

Thoughts?

[This message has been edited by wpg_87gt (edited 11-13-2023).]

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